Bump apps/spree from `3b9f41b` to `6715682`
Bump apps/spree from `3b9f41b` to `6715682`

Bumps [apps/spree](https://github.com/spree/spree) from `3b9f41b` to `6715682`.
- [Release notes](https://github.com/spree/spree/releases)
- [Commits](https://github.com/spree/spree/compare/3b9f41b8e6322e02c060016b604e187523cf368c...67156827811a777c5fdd49d3adb246ccbe55409f)
eliotsykes/real-world-rails